fix for anchor & insertRight behavior

Do not move the anchor down when it is at column 0 and lines are
inserted at that

lib/ace/anchor.js

@@ -131,7 +131,10 @@ var Anchor = exports.Anchor = function(doc, row, column) {
                 row += end.row - start.row;
             }
         } else if (delta.action === "insertLines") {
-            if (start.row <= row) {
+            if (start.row === row && column === 0 && this.$insertRight) {
+                // do nothing
+            }
+            else if (start.row <= row) {
                 row += end.row - start.row;
             }
         } else if (delta.action === "removeText") {

lib/ace/anchor_test.js

@@ -58,6 +58,15 @@ module.exports = {
         assert.position(anchor.getPosition(), 1, 7);
     },
 
+    "test insert text at anchor should not move anchor when insertRight is true": function() {
+        var doc = new Document("juhu\nkinners");
+        var anchor = new Anchor(doc, 1, 4);
+        anchor.$insertRight = true;
+        
+        doc.insert({row: 1, column: 4}, "123");
+        assert.position(anchor.getPosition(), 1, 4);
+    },    
+    
     "test insert lines before cursor should move anchor row": function() {
         var doc = new Document("juhu\nkinners");
         var anchor = new Anchor(doc, 1, 4);
@@ -66,6 +75,32 @@ module.exports = {
         assert.position(anchor.getPosition(), 3, 4);    
     },
 
+    "test insert lines at anchor position should move anchor down": function() {
+        var doc = new Document("juhu\nkinners");
+        var anchor = new Anchor(doc, 1, 0);
+        
+        doc.insertLines(1, ["line"]);
+        assert.position(anchor.getPosition(), 2, 0);
+    },
+    
+    "test insert lines at anchor position should not move anchor down when insertRight is true and column is 0": function() {
+        var doc = new Document("juhu\nkinners");
+        var anchor = new Anchor(doc, 1, 0);
+        anchor.$insertRight = true;
+        
+        doc.insertLines(1, ["line"]);
+        assert.position(anchor.getPosition(), 1, 0);
+    }, 
+
+    "test insert lines at anchor row should move anchor down when column > 0": function() {
+        var doc = new Document("juhu\nkinners");
+        var anchor = new Anchor(doc, 1, 2);
+        anchor.$insertRight = true;
+        
+        doc.insertLines(1, ["line"]);
+        assert.position(anchor.getPosition(), 2, 2);            
+    },
+    
     "test insert new line before cursor should move anchor column": function() {
         var doc = new Document("juhu\nkinners");
         var anchor = new Anchor(doc, 1, 4);